Method for obtaining lactate from lactic acid fermentation liquor
A lactic acid fermentation and lactic acid ester technology, which is applied in the separation/purification of carboxylic acid esters, carboxylic acid ester preparation, chemical instruments and methods, etc., can solve the problems of complex separation process of bio-based lactic acid, and achieve reduced energy consumption, low The effect of high production cost and high purity
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Embodiment 1
[0027] Take 100L of sodium salt fermentation broth with a lactic acid concentration of 125.0g / L and filter through a 0.2μm microfiltration membrane and an ultrafiltration membrane with a molecular weight cutoff of 5000 Daltons to remove bacteria and large particle suspensions to obtain 98L of ultrafiltrate. The concentration was 126.9g / L, and the ultrafiltrate was concentrated until the mass concentration of lactic acid was 60%, to obtain 19.9L of concentrated solution. Mix the above concentrate with 16.9kg of methanol, add 6.6kg of sulfuric acid, stir at 58°C for 30 minutes, filter the precipitate containing sodium sulfate, and obtain 35.0kg (33.8L) of esterified clear liquid, which is further processed by bipolar membrane to obtain deionized ester The clear liquid was removed, 138 L of toluene was added, and 10.9 kg of methyl lactate was obtained by extracting and rectifying at 0.05 MPa. The purity of methyl lactate was 99.9%.
Embodiment 2
[0029] Take 100L of sodium salt fermentation broth with a lactic acid concentration of 125.0g / L and filter through a 0.2μm microfiltration membrane and an ultrafiltration membrane with a molecular weight cutoff of 5000 Daltons to remove bacteria and large particle suspensions to obtain 98L of ultrafiltrate. The concentration was 126.9g / L, and the ultrafiltrate was concentrated until the mass concentration of lactic acid was 60%, to obtain 19.9L of concentrated solution. Mix the above concentrate with 30.3kg of ethanol, add 6.7kg of sulfuric acid, stir at 58°C for 30 minutes, filter the precipitate containing sodium sulfate, and obtain 48.5kg (46.8L) of esterified clear liquid, which is further processed by bipolar membrane to obtain deionized ester Clear the liquid, add 240 L of p-xylene, and rectify at 0.05 MPa to obtain 11.8 kg of ethyl lactate with a purity of 99.9%.
Embodiment 3
[0031] Take 100L of sodium salt fermentation broth with a lactic acid concentration of 125.0g / L and filter through a 0.2μm microfiltration membrane and an ultrafiltration membrane with a molecular weight cutoff of 5000 Daltons to remove bacteria and large particle suspensions to obtain 98L of ultrafiltrate. The concentration was 126.9g / L, and the ultrafiltrate was concentrated until the mass concentration of lactic acid was 60%, to obtain 19.9L of concentrated solution. Mix the above concentrate with 39.8kg of n-propanol, add 6.7kg of sulfuric acid, stir at 60°C for 30 minutes, filter the precipitate containing sodium sulfate, and obtain 58.9kg (55L) of esterified clear liquid, which is further treated with a bipolar membrane to obtain deionized Esterify the supernatant, add 300 L of o-xylene, and rectify at 0.05 MPa to obtain 14.4 kg of n-propyl lactate with a purity of 99.9%.
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